Abstract
Measurements have been made of the noise current fluctuations on the electron beam from a space-charge limited diode electron gun, at 1,400 Mc/s, 4,250 Mc/s, and 9,520 Mc/s. Theories which do not consider the finite beam diameter and the multivelocity nature of the stream in the region of the potential minimum are in poor agreement with experiment. The measurements here reported and those of other workers are compared with the results of theoretical calculations in which these two effects are considered. Significant improvement in agreement with experiment is realized.
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